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Commit 6cea0477 authored by Sami Tolvanen's avatar Sami Tolvanen Committed by Alistair Delva
Browse files

ANDROID: kbuild: merge module sections with LTO 



LLD always splits sections with LTO, which increases module sizes. This
change adds a linker script that merges the split sections in the final
module.

Bug: 145297228
Change-Id: I247e8bd029bd0f98a4fa1cd4db7f6398467b8e55
Suggested-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarSami Tolvanen <samitolvanen@google.com>
parent f0723e3b

Makefile

+2 −0
Original line number Diff line number Diff line
@@ -821,6 +821,8 @@ lto-clang-flags := -flto 
endif

lto-clang-flags += -fvisibility=default $(call cc-option, -fsplit-lto-unit)



KBUILD_LDS_MODULE += $(srctree)/scripts/module-lto.lds



# allow disabling only clang LTO where needed

DISABLE_LTO_CLANG := -fno-lto

export DISABLE_LTO_CLANG

scripts/module-lto.lds

0 → 100644
+22 −0
Original line number Diff line number Diff line 
/*

 * With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and

 * -ffunction-sections, which increases the size of the final module.

 * Merge the split sections in the final binary.

 */

SECTIONS {

	/*

	 * LLVM may emit .eh_frame with CONFIG_CFI_CLANG despite

	 * -fno-asynchronous-unwind-tables. Discard the section.

	 */

	/DISCARD/ : {

		*(.eh_frame)

	}



	.bss : { *(.bss .bss[.0-9a-zA-Z_]*) }

	.data : { *(.data .data[.0-9a-zA-Z_]*) }

	.rela.data : { *(.rela.data .rela.data[.0-9a-zA-Z_]*) }

	.rela.rodata : { *(.rela.rodata .rela.rodata[.0-9a-zA-Z_]*) }

	.rela.text : { *(.rela.text .rela.text[.0-9a-zA-Z_]*) }

	.rodata : { *(.rodata .rodata[.0-9a-zA-Z_]*) }

	.text : { *(.text .text[.0-9a-zA-Z_]*) }

}